From 59f30abe94bff50636c8cad45207a01fdcb2ee49 Mon Sep 17 00:00:00 2001 From: Rik van Riel Date: Fri, 24 Apr 2015 15:24:27 -0400 Subject: [PATCH] show isolated cpus in sysfs After system bootup, there is no totally reliable way to see which CPUs are isolated, because the kernel may modify the CPUs specified on the isolcpus= kernel command line option. Export the CPU list that actually got isolated in sysfs, specifically in the file /sys/devices/system/cpu/isolated This can be used by system management tools like libvirt, openstack, and others to ensure proper placement of tasks. Suggested-by: Li Zefan Signed-off-by: Rik van Riel Acked-by: Mike Galbraith Acked-by: Chris Metcalf Signed-off-by: Greg Kroah-Hartman --- drivers/base/cpu.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c index f160ea44a86d..ea23ee7b545b 100644 --- a/drivers/base/cpu.c +++ b/drivers/base/cpu.c @@ -265,6 +265,17 @@ static ssize_t print_cpus_offline(struct device *dev, } static DEVICE_ATTR(offline, 0444, print_cpus_offline, NULL); +static ssize_t print_cpus_isolated(struct device *dev, + struct device_attribute *attr, char *buf) +{ + int n = 0, len = PAGE_SIZE-2; + + n = scnprintf(buf, len, "%*pbl\n", cpumask_pr_args(cpu_isolated_map)); + + return n; +} +static DEVICE_ATTR(isolated, 0444, print_cpus_isolated, NULL); + static void cpu_device_release(struct device *dev) { /* @@ -431,6 +442,7 @@ static struct attribute *cpu_root_attrs[] = { &cpu_attrs[2].attr.attr, &dev_attr_kernel_max.attr, &dev_attr_offline.attr, + &dev_attr_isolated.attr, #ifdef CONFIG_GENERIC_CPU_AUTOPROBE &dev_attr_modalias.attr, #endif -- 2.39.5